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Commit	Line	Data
	1	/*
	2	* Copyright (c) 2000-2004 Apple Computer, Inc. All rights reserved.
	3	*
	4	* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
	5	*
	6	* This file contains Original Code and/or Modifications of Original Code
	7	* as defined in and that are subject to the Apple Public Source License
	8	* Version 2.0 (the 'License'). You may not use this file except in
	9	* compliance with the License. The rights granted to you under the License
	10	* may not be used to create, or enable the creation or redistribution of,
	11	* unlawful or unlicensed copies of an Apple operating system, or to
	12	* circumvent, violate, or enable the circumvention or violation of, any
	13	* terms of an Apple operating system software license agreement.
	14	*
	15	* Please obtain a copy of the License at
	16	* http://www.opensource.apple.com/apsl/ and read it before using this file.
	17	*
	18	* The Original Code and all software distributed under the License are
	19	* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
	20	* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
	21	* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
	22	* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
	23	* Please see the License for the specific language governing rights and
	24	* limitations under the License.
	25	*
	26	* @APPLE_OSREFERENCE_LICENSE_HEADER_END@
	27	*/
	28
	29	#include <kern/kalloc.h>
	30	#include <libkern/OSAtomic.h>
	31	#include <sys/errno.h>
	32	#include <net/init.h>
	33	#include <libkern/libkern.h>
	34	#include <string.h>
	35
	36	struct init_list_entry {
	37	struct init_list_entry *next;
	38	net_init_func_ptr func;
	39	};
	40
	41	#define LIST_RAN ((struct init_list_entry*)0xffffffff)
	42	static struct init_list_entry *list_head = 0;
	43
	44	errno_t
	45	net_init_add(
	46	net_init_func_ptr init_func)
	47	{
	48	struct init_list_entry *entry;
	49
	50	if (init_func == 0) {
	51	return EINVAL;
	52	}
	53
	54	/* Check if we've already started */
	55	if (list_head == LIST_RAN) {
	56	return EALREADY;
	57	}
	58
	59	entry = kalloc(sizeof(*entry));
	60	if (entry == 0) {
	61	printf("net_init_add: no memory\n");
	62	return ENOMEM;
	63	}
	64
	65	bzero(entry, sizeof(*entry));
	66	entry->func = init_func;
	67
	68	do {
	69	entry->next = list_head;
	70
	71	if (entry->next == LIST_RAN) {
	72	/* List already ran, cleanup and call the function */
	73	kfree(entry, sizeof(*entry));
	74	return EALREADY;
	75	}
	76	} while(!OSCompareAndSwap((UInt32)entry->next, (UInt32)entry,
	77	(UInt32*)&list_head));
	78
	79	return 0;
	80	}
	81
	82	__private_extern__ void
	83	net_init_run(void)
	84	{
	85	struct init_list_entry *backward_head = 0;
	86	struct init_list_entry *forward_head = 0;
	87	struct init_list_entry *current = 0;
	88
	89	/*
	90	* Grab the list, replacing the head with 0xffffffff to indicate
	91	* that we've already run.
	92	*/
	93	do {
	94	backward_head = list_head;
	95	} while (!OSCompareAndSwap((UInt32)backward_head, (UInt32)LIST_RAN,
	96	(UInt32*)&list_head));
	97
	98	/* Reverse the order of the list */
	99	while (backward_head != 0) {
	100	current = backward_head;
	101	backward_head = current->next;
	102	current->next = forward_head;
	103	forward_head = current;
	104	}
	105
	106	/* Call each function pointer registered */
	107	while (forward_head != 0) {
	108	current = forward_head;
	109	forward_head = current->next;
	110	current->func();
	111	kfree(current, sizeof(*current));
	112	}
	113	}